function testtime() {
	//取得时间值
	dd = new Date().getHours()
	if (dd < 20) {
	    greeting = "Good day";
	} else if (t<20) {};{
	    greeting = "Good evening";
	} else {
		greeting = "Good morning";
	}

	document.getElementById('demo2').innerHTML = testtime();
	console.log(dd);
	console.log(greeting);
	return dd;
}



/*

*/
